Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e4ea15cd1ac30c…

MALICIOUS

PDF

68.4 KB Created: 2021-09-29 00:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d60abf7fad1a2832da0a59c0c3704097 SHA-1: d6fd85b92ebe04305a6375bcd79dea1394951a7c SHA-256: b0e4ea15cd1ac30c6853ad1debd576ed5e096f2e557b188aa2493f881a4c7116
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, designed to trick users into clicking a link. It contains numerous links to disposable hosting, suggesting a link farm used to obscure the final malicious destination. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent to redirect users, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://stardentalcare.org/userfiles/file/91148983769.pdf In PDF document text
    • http://mstreatmentadvances.com/userfiles/files/21970886161.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/pesovilibi.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/baxukikaxuzisubevilaz.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/mirobefiwubigukupe.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/nufir.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/xipumawujuvaso.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad3e6585e2---22525805382.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/kimivewikigixuf.pdfIn PDF document text
    • http://standardamulet.com/files/files/watibekito.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/pebaz.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/30625224518.pdfIn PDF document text
    • http://xn--evdebakmhizmetleri-k0c.com/uploads/file/33699486477.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109140336331022.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/baruvikupip.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/pupifodoro.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/18315987212.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/9922128318.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/salumegasojegoji.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/85354090861.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/koxuzovagasinini.pdfIn PDF document text
    • http://mylead.mandiricareer.net/contents/files/nifiwuputasumeledopad.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/wokurepizinofakofagalag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=fnaf+4+ios+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB005 13896 bytes
SHA-256: f071818d1fa6d4d6f5728d5504192cbb9b20842012fa47c25c2a14e7be1af507
font_01_sfnt_off0000d25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25F 10388 bytes
SHA-256: 27d0847cc2e4489569a87b8fe550b9219bedb00ccd54a9257b51ad646ad69119
font_02_sfnt_off0000ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1